Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c901807521edeea…

MALICIOUS

PDF

42.7 KB Created: 2021-06-03 06:25:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 26e3762d207fe28a27d470dbe39642dc SHA-1: baa9544c7871907d209e937eeb138ef72fe276e2 SHA-256: 1c901807521edeea4760a57bc54ef2c823250d1922ca8528eb61000addc8eef1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The primary lure appears to be related to 'free spins' for a game, a common social engineering tactic. The document body and embedded links suggest an attempt to direct the user to a site that likely serves a malicious payload or initiates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/links-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/login-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D34 24432 bytes
SHA-256: 76c3271f2b6cb23995345bdbb68e3dc73b63dc6286409c4f54eba3fd8965bd13
font_01_sfnt_off000084df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 18056 bytes
SHA-256: 09d5214532ffde87c42515cbc4f454f72aa6a3fcd547f3e5323fe8ee16367066

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